Method and apparatus for NOx abatement in lean gaseous streams
    3.
    发明授权
    Method and apparatus for NOx abatement in lean gaseous streams 失效
    稀气流中NOx减排的方法和装置

    公开(公告)号:US06471924B1

    公开(公告)日:2002-10-29

    申请号:US08645363

    申请日:1996-05-13

    IPC分类号: B01D5356

    摘要: A method for reduction of NOx in a lean gaseous stream includes passing the gaseous stream at a temperature within the NOx sorbing temperature range through a catalyzed trap member having an oxidation catalyst intimately combined with a sorbent material. The sorbed NOx is periodically removed by introducing a combustible component into the gaseous stream and oxidizing it on the trap member to thermally desorb the NOx. The amount of combustible component introduced is limited to maintain the gaseous stream bulk composition lean and to avoid increasing the bulk temperature of the gaseous stream to a temperature which is too high for effective lean NOx abatement treatment. A suitable NOx abatement catalyst is used to reduce the desorbed NOx. Sorbing (trapping) and desorbing periods are alternated, usually in response to the temperature of the gaseous stream, and an apparatus to carry out the process is provided.

    摘要翻译: 用于还原贫气流中的NOx的方法包括使气流在NOx吸附温度范围内的温度下通过具有与吸附剂材料紧密结合的氧化催化剂的催化捕集构件。 通过将可燃组分引入气流中并在捕集构件上氧化吸附的NOx以热解吸NOx,周期性地除去吸附的NOx。 引入的可燃组分的量被限制以保持气流体组合物变稀,并且避免将气流的体积温度升高到对于有效的贫NOx排放处理来说太高的温度。 使用合适的NOx减排催化剂来减少脱附的NOx。 吸附(捕集)和解吸时间通常是响应于气流的温度而交替的,并且提供了一种执行该过程的装置。

    Lean NO.sub.x catalyst/trap method
    4.
    发明授权
    Lean NO.sub.x catalyst/trap method 失效
    精益NOx催化剂/捕集法

    公开(公告)号:US5874057A

    公开(公告)日:1999-02-23

    申请号:US500657

    申请日:1995-07-12

    摘要: A NO.sub.x abatement composition comprises a NO.sub.x abatement catalyst and a NO.sub.x sorbent material which are dispersed in proximity to, but segregated from, each other on a common refractory carrier member (10). The NO.sub.x sorbent material comprises a basic oxygenated metal compound and optionally further comprises ceria. The NO.sub.x abatement catalyst contains a catalytic metal component including a platinum metal catalytic component. The catalytic metal component is segregated from the NO.sub.x sorbent material, which may be one or more of metal oxides, metal carbonates, metal hydroxides and mixed metal oxides. At least the catalytic metal component and the NO.sub.x sorbent material must be on, or comprise separate, particles; the particles may either be admixed or may be disposed in separate layers (20a, 20b) on the carrier member (10). A NO.sub.x abatement method employs the composition and includes periodically adjusting the gas being treated between lean and stoichiometric/rich operating cycles.

    摘要翻译: NOx消除组合物包括在普通耐火材料承载构件(10)上分散在彼此附近但彼此分离的NOx消除催化剂和NOx吸附剂材料。 NOx吸附剂材料包含碱性氧化金属化合物,并且任选地还包含二氧化铈。 NOx消除催化剂含有包含铂金属催化组分的催化金属成分。 催化金属组分与NO x吸附剂材料分离,其可以是金属氧化物,金属碳酸盐,金属氢氧化物和混合金属氧化物中的一种或多种。 至少催化金属组分和NOx吸附剂材料必须在或包含分开的颗粒; 可以将颗粒混合或者可以设置在载体构件(10)上的分开的层(20a,20b)中。 NOx减排方法采用该组合物并且包括周期性地调节在稀薄和理论空燃比/丰富的操作循环之间被处理的气体。

    Method of abating NO.sub.x and a catalytic material therefor
    7.
    发明授权
    Method of abating NO.sub.x and a catalytic material therefor 失效
    减轻NOx及其催化材料的方法

    公开(公告)号:US6080377A

    公开(公告)日:2000-06-27

    申请号:US430065

    申请日:1995-04-27

    摘要: A method for reducing gaseous nitrogen oxides present in a gas stream by reaction with a reductant species is practiced by flowing the gas stream under lean NO.sub.X -reducing conditions in contact with a catalytic material containing a catalytically effective amount of a catalytic species, e.g., a platinum group metal, and a reductant storage material, e.g., a zeolite, effective for storing reductant species for reaction with NO.sub.X, and providing an intermittent supply of the reductant to the gas stream. The catalytic material may be prepared in any manner, but one method is to incorporate a catalytically effective amount of the platinum into a template-bearing molecular sieve material, preferably ZSM-5 zeolite, to hinder the platinum from being incorporated into the pores of the molecular sieve material, and then calcining the molecular sieve material, whereby the template is removed from the molecular sieve material after the platinum is incorporated therein. Another method is to add a blocking agent to the molecular sieve material, then incorporate the platinum therein, and then calcine the material to remove the blocking agent. The catalytic material may contain less than about two percent by weight of zeolite plus platinum, e.g., less than about 0.5%, or from about 0.025% to 0.1% or 0.2% platinum.

    摘要翻译: 通过与还原剂物质反应来还原存在于气流中的气态氮氧化物的方法是通过在贫NOX还原条件下与含有催化有效量的催化物质(例如, 铂族金属和还原剂储存材料,例如有效地存储用于与NOX反应的还原剂物质的沸石,以及向气流中间歇地供应还原剂。 催化材料可以以任何方式制备,但是一种方法是将催化有效量的铂掺入含模板的分子筛材料,优选ZSM-5沸石中,以阻止铂被引入到 分子筛材料,然后煅烧分子筛材料,由此在引入铂后,从分子筛材料中除去模板。 另一种方法是向分子筛材料中加入封闭剂,然后在其中加入铂,然后煅烧该材料以除去封闭剂。 催化材料可以含有小于约2重量%的沸石加铂,例如小于约0.5%,或约0.025%至0.1%或0.2%的铂。

    Catalytic combustion system including a separator body
    8.
    发明授权
    Catalytic combustion system including a separator body 失效
    催化燃烧系统包括分离器体

    公开(公告)号:US5551239A

    公开(公告)日:1996-09-03

    申请号:US271244

    申请日:1994-07-07

    摘要: A combustor for supporting the catalytic combustion of gaseous carbonaceous fuel contains a catalyst zone in which is disposed a catalyst body comprising at least one catalyst member, a separator zone comprising a separator body and a downstream zone where homogeneous combustion occurs. The catalyst member contains a carrier and a catalyst material deposited thereon. The catalyst body may, optionally, contain additional catalyst members downstream of the at least one catalyst member. The separator body contains a carrier-type monolith containing ceramic fibers in a matrix. One of the optional additional catalyst members may also contain such a monolith on which the catalyst composition is disposed.

    摘要翻译: 用于支撑气态含碳燃料的催化燃烧的燃烧器包含催化剂区域,其中设置有包括至少一个催化剂构件的催化剂体,包括分离器体的分离区和发生均匀燃烧的下游区。 催化剂构件包含沉积在其上的载体和催化剂材料。 催化剂体可以任选地在至少一个催化剂构件的下游含有另外的催化剂组分。 分离器主体包含载体型整料,其包含基体中的陶瓷纤维。 任选的另外的催化剂构件之一也可以含有这样的整料,其上设置催化剂组合物。

    Catalyst configuration for catalytic combustion systems
    9.
    发明授权
    Catalyst configuration for catalytic combustion systems 失效
    用于催化燃烧系统的催化剂配置

    公开(公告)号:US5474441A

    公开(公告)日:1995-12-12

    申请号:US22248

    申请日:1993-02-25

    CPC分类号: F23C13/00 F23C13/08 F23R3/40

    摘要: A catalyst bed (30) for a combustor (18) for supporting the catalytic combustion of a gaseous air/fuel (e.g., methane or natural gas) combustion mixture contains an igniter catalyst member (1) upstream of a promoter catalyst member (2). The catalyst members each comprise carrier monoliths, the igniter catalyst member (1) having an igniter catalyst material deposited thereon and the promoter catalyst member (2) having a promoter catalyst material deposited thereon. The igniter catalyst material is distinguished from the promoter catalyst material in one or more of the following ways: the igniter catalyst material may have (a) a higher catalytic activity for combustion of the air/fuel mixture, (b) a lower catalyst deactivation temperature than the promoter catalyst material, and/or (c) the promoter catalyst regeneration temperature range brackets the upper limit of the regeneration temperature range of the igniter catalyst.

    摘要翻译: 用于支撑气态空气/燃料(例如,甲烷或天然气)燃烧混合物的催化燃烧的燃烧器(18)的催化剂床(30)在促进剂催化剂构件(2)的上游含有点火器催化剂构件(1) 。 催化剂构件各自包括载体整料,其上沉积有点火器催化剂材料的点火器催化剂构件(1)和其上沉积有助催化剂材料的助催化剂构件(2)。 点火器催化剂材料以一种或多种以下方式与助催化剂材料不同:点火器催化剂材料可具有(a)对于空气/燃料混合物燃烧的较高催化活性,(b)较低的催化剂失活温度 和/或(c)助催化剂催化剂再生温度范围包括点火器催化剂的再生温度范围的上限。

    Method of abating NO.sub.x and preparation of catalytic material therefor
    10.
    发明授权
    Method of abating NO.sub.x and preparation of catalytic material therefor 失效
    降低NOx的方法及其催化剂的制备

    公开(公告)号:US06150291A

    公开(公告)日:2000-11-21

    申请号:US250652

    申请日:1999-02-16

    摘要: A method for reducing gaseous nitrogen oxides present in a gas stream by reaction with a reductant species is practiced by flowing the gas stream under lean NO.sub.X -reducing conditions in contact with a catalytic material containing a catalytically effective amount of a catalytic species, e.g., a platinum group metal, and a reductant storage material, e.g., a zeolite, effective for storing reductant species for reaction with NO.sub.X, and providing an intermittent supply of the reductant to the gas stream. The catalytic material may be prepared in any manner, but one method is to incorporate a catalytically effective amount of the platinum into a template-bearing molecular sieve material, preferably ZSM-5, to hinder the platinum from being incorporated into the pores of the molecular sieve material, and then calcining the molecular sieve material, whereby the template is removed from the molecular sieve material after the platinum is incorporated therein. Another method is to add a blocking agent to the molecular sieve material, then incorporate the platinum therein, and then calcine the material to remove the blocking agent. The catalytic material may contain less than about two percent by weight of zeolite plus platinum, e.g., less than about 0.5%, or from about 0.025% to 0.1% or 0.2% platinum.

    摘要翻译: 通过与还原剂物质反应来还原存在于气流中的气态氮氧化物的方法是通过在贫NOX还原条件下与含有催化有效量的催化物质(例如, 铂族金属和还原剂储存材料,例如有效地存储用于与NOX反应的还原剂物质的沸石,以及向气流中间歇地供应还原剂。 催化材料可以以任何方式制备,但是一种方法是将催化有效量的铂掺入含模板的分子筛材料,优选ZSM-5中,以阻止铂结合到分子的孔中 筛分材料,然后煅烧分子筛材料,由此在引入铂后,从分子筛材料中除去模板。 另一种方法是向分子筛材料中加入封闭剂,然后在其中加入铂,然后煅烧该材料以除去封闭剂。 催化材料可以含有小于约2重量%的沸石加铂,例如小于约0.5%,或约0.025%至0.1%或0.2%的铂。